▎ 摘　　要

This work reported the fabrication of bovine serum albumin stabilised gold nanoclusters (BSA-Au NCs)-graphene oxide nanocomplex (BSA-Au NCs-GO) as a turn-on' fluorescent probe for the detection of Cd2+. The prepared BSA-Au NCs showed an intense red fluorescence, and the fluorescence of BSA-Au NCs was reduced significantly by graphene oxide due to its excellent quenching properties. However, in the presence of 65 mu mol l(-1) Cd2+, the fluorescence intensity recovered to 82.5% of the intensity of BSA-Au NCs, and the fluorescence intensity increased 1.3-fold relative to the BSA-Au NCs-GO nanocomplex. This proposed probe expands the application of BSA-Au NCs, which can be used as a reversible fluorescence nanoswitch for inexpensive, label free and simple detection of Cd2+ in the aqueous samples.